Power Sunroof Malfunction
Power Sunroof Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The sunroof control module supplies each of the sunroof switch signal circuits with a 12-volt reference. When a switch is pressed the signal circuit is pulled low signaling the sunroof open or close request. The module determines the motor direction based on inputs received from the sunroof switch.
Diagnostic Aids
Prior to performing the sunroof system circuit diagnosis, perform the Sunroof Motor/Actuator Initialization/Teach Process (Testing and Inspection).
Reference Information
Schematic Reference
Sunroof Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Sunroof Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. With the sunroof in the closed position, press the sunroof open switch. The sunroof should open.
• If the sunroof does not open, refer to Power Sunroof Malfunction.
2. With the sunroof in the open position, press the sunroof close switch. The sunroof should close.
• If the sunroof does not close, refer to Power Sunroof Malfunction.
3. With the sunroof in the closed position, operate the sunroof express open feature. The sunroof should fully open.
• If the express open feature does not function, refer to Power Sunroof Express Feature Malfunction.
4. With the sunroof in the open position, operate the sunroof express close feature. The sunroof should fully close.
• If the express close feature does not function, refer to Power Sunroof Express Feature Malfunction.
5. With the sunroof in the closed position, press the sunroof vent open switch. The sunroof should open.
• If the sunroof does not open, refer to Power Sunroof Malfunction.
6. With the sunroof in the open vent position, press the sunroof vent close switch. The sunroof should close.
• If the sunroof does not close, refer to Power Sunroof Malfunction.
Circuit/System Testing
Important: Because of the accessibility of the sunroof switch, perform the sunroof switch component test before beginning the Circuit/System Testing.
Power Sunroof Malfunction
1. Ignition OFF, disconnect the harness connector at the sunroof control module.
2. Test for less than 5.0 ohm between the ground circuit terminal 2 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the fuse and replace the sunroof control module.
4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.
• If the test lamp does not illuminate, test the ignition circuit for an open/high resistance. If the circuit tests normal, refer to Retained Accessory Power Malfunction (Retained Accessory Power Malfunction).
5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 6 and ground.
• If the test lamp does not illuminate, test the ignition circuit for an open/high resistance. If the circuit tests normal, refer to Retained Accessory Power Malfunction (Retained Accessory Power Malfunction).
6. Ignition OFF, connect the harness connector at the sunroof control module.
7. Disconnect the harness connector at the sunroof switch.
8. Test for less than 5.0 ohm between the ground circuit terminal 5 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
Important: Apply ground to the module for no longer than 2 seconds at a time or the module could be damaged.
When performing the following tests, make sure that the sunroof or sunshade is not at its end of travel position by switching the grounded jumper to the other signal circuit if the sunroof or sunshade does not move in one direction.
9. Ignition ON, momentarily install a 10-amp fused jumper wire between the signal circuit terminal 6 and ground. The sunroof should move.
• If the sunroof does not move, test the signal circuit for a short to ground, short to voltage or an open/high resistance. If the circuit test is normal, replace the sunroof control module.
10. Momentarily install a 10-amp fused jumper wire between the signal circuit terminal 4 and ground. The sunroof should move.
• If the sunroof does not move, test the signal circuit for a short to ground, short to voltage or an open/high resistance. If the circuit test is normal, replace the sunroof control module.
11. With the sunroof in the fully closed position, momentarily install a 10-amp fused jumper wire between the signal circuit terminal 2 and ground. The sunroof should vent open.
• If the sunroof does not vent open, test the signal circuit for a short to ground, short to voltage or an open/high resistance. If the circuit test is normal, replace the sunroof control module.
12. Momentarily install a 10-amp fused jumper wire between the signal circuit terminal 8 and ground. The sunroof should close.
• If the sunroof does not close, test the signal circuit for a short to ground, short to voltage or an open/high resistance. If the circuit test is normal, replace the sunroof control module.
13. If all circuits test normal, test or replace the sunroof switch.
Power Sunroof Express Feature Malfunction
1. Ignition OFF, disconnect the harness connector at the sunroof switch.
2. Ignition ON, with the sunroof in the closed position, connect a 3-amp fused jumper wires between both signal circuits listed below and ground for less than 1 second. The sunroof should express open.
* Terminal 1
* Terminal 6
• If the sunroof does not express open, test the signal circuit terminal 1 for a short to voltage or an open high resistance. If the circuit tests normal, replace the sunroof control module.
3. Ignition ON, with the sunroof in the open position, connect a 3-amp fused jumper wire between both signal circuits listed below and ground for less than 1 second. The roof should express close.
* Terminal 1
* Terminal 4
• If the roof does not express close, test the signal circuit terminal 1 for a short to voltage or an open high resistance. If the circuit tests normal, replace the sunroof control module.
4. If all circuits test normal, test or replace the sunroof switch.
Component Testing
Sunroof Switch
1. Ignition OFF, disconnect the harness connector at the sunroof switch.
2. Test for infinite resistance between the switch terminals listed below and the ground circuit terminal 5 with the switch in the neutral position.
* Express open/close terminal 1
* Sunroof close terminal 4
* Sunroof open terminal 6
* Vent close terminal 8
* Vent open terminal 2
• If not the specified value, replace the sunroof switch.
3. Test for less than 5 ohms between the switch terminals listed below and the ground circuit terminal 5 with the switch in the appropriate position.
* Express open/close terminal 1
* Sunroof close terminal 4
* Sunroof open terminal 6
* Vent close terminal 8
* Vent open terminal 2
• If greater than the specified value, replace the sunroof switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Sunroof Motor/Actuator Replacement (Service and Repair)
* Sunroof Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for sunroof control module replacement, setup, and programming